Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e538233d6e48b33…

MALICIOUS

PDF

106.4 KB Created: 2021-08-09 20:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 52623ec0fb616a44b793ac24d5ccfa95 SHA-1: 1b5f1715dcb06df5a72cf7a1217528c11e53c41d SHA-256: 8e538233d6e48b33dba2575354826ddb111dea8909e75e2482f6cae6c2ba0ad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://faradtvandor.hu/picture/userfiles/file/17003646973.pdf In PDF document text
    • http://snap-drone.com/userfiles/file/22185912429.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2268c4b92---11494117032.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/84174549978.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/14118654749.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/zodevatujotifakufuxukat.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5855d18f069f2582b4dc27492982ae21/xajewirulidowez.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861c06df088---bikimewukereromusafelefok.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/86855140665.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/47422479904.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/vinutezegogi.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/nutulunepame.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/cqems0748lb7bu7ellgfoef0vo/galezedopuwitijegu.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/wujavekokete.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16109dba4c6327---bodigumi.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/26858207154.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0062fe3df70114384d16c171f107dee0/bupafunizinawugosidek.pdfIn PDF document text
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/gituvizarajudapanuzuzexiz.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c390c626d---mogemobejodarutefinot.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609433cb5806a---fodatafubo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1cf5a50e1c3df368d30165ce6958f33f/gumesidejanuwimap.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/86596371574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=planeaci%C3%B3n+espa%C3%B1ol+1+secundaria+primer+trimestrePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13713 11172 bytes
SHA-256: becc01e801eae04486cc07bb47fa39238c835552bcadfbe2668d2a7449126a64
font_01_sfnt_off000150bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168CE 19112 bytes
SHA-256: 52a0bcd3cea334fd40f3b79f98dea0e226db5fb2acc2232e6eede957cfea5671

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